n | a(n) |
---|---|
0 | 2 |
1 | 9 |
2 | 36 |
3 | 140 |
4 | 540 |
5 | 2079 |
6 | 8008 |
7 | 30888 |
8 | 119340 |
9 | 461890 |
10 | 1790712 |
11 | 6953544 |
12 | 27041560 |
13 | 105306075 |
14 | 410605200 |
15 | 1602881040 |
16 | 6263890380 |
17 | 24502865310 |
18 | 95937144600 |
19 | 375945078600 |
20 | 1474358525640 |
21 | 5786272150230 |
22 | 22724268808176 |
23 | 89301056353200 |
24 | 351140573438200 |
25 | 1381487341784004 |
[2,9,36,140,540,2079,8008,30888,119340,461890, 1790712,6953544,27041560,105306075,410605200, 1602881040,6263890380,24502865310,95937144600, 375945078600,1474358525640,5786272150230, 22724268808176,89301056353200,351140573438200, 1381487341784004] |